Welding-torch.



J. GALBRAITH.

WELDING TORCH. 1

APPLICATION FILED MAR. 12, 1914.

Patented Oct. 6, 1914.

UNITED STATES PATENT FFIC.

JAMES GALIBRAI'IH, or CHICAGO, rnnmoranssreuon or ONE-HALF To'NIELs c. sonnnsnn, or CHICAGO, ILLINOIS.

WELDING-TORCH.

Specification of Letters Patent.

Application filed March 12,1914. Serial No. 824,141.

To all whom it may concern Be it known that 1, JAMES GALBRAITH', a

of the city of Chicago, county of Cook, and State 'of Illinois, have invented certain new and useful Improvements in Welding- Torches,'of which the. following is a specification.

My invention relates to welding torches and more specifically to that class thereof designed for use with oxygen and acetylene gas as fuel, torches of this description being commonly designated as oxygen acetylene torches.

The object of my invention is the production of a torch of the character mentioned which will be of simple construction, one in which the feeding of the two gases thereto will not be interfered with by reason of the pressure of one gas dropping far below normal and one in which ignition in the mixing chamber or popping back will be prevented.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawing forming a part of this specification, and in which Figure 1 is a side elevation of a welding torch embodying my invention, and Fig. 2

is an enlarged central section of they head of the torch detached.

The preferred form \of construction as illustrated in the drawing comprises a pair of fuel supply pipes 1 and 2 which are suitably mounted in a holder 3. At the rearward ends of pipes 1 and 2 are provided ordinary stop cocks 4 and 5 respectively for controlling the flow of fuel to said pipes.

The pipes 1 and 2 are connected at their forward ends with a head 6, the pipe 1 communicating with an elongated chamber or passage 7 provided centrally in head 6, and the pipe 2 communicating with a passage 8 formed in said head. An outlet passage 9 extends from the inner end of chamber '7 to the forward end of head 6 and in axial alinement with said chamber. The passage 8 is disposed at an acute angle to chamber 7, passes through one corner thereof and joins passage 9 near the inner end of the latter. The diameters of chamber 7. and passage 8 sures.

are of lengths corresponding to the ratio of ten to two respectively and the diameter of passage 9 is slightly larger than that of passage 8, see Fig. 2. The outlet passage 9 is in communication with a tip 10 of conventional constructlon.

Patented ea. c, 1914.

In use pipe 1 is connected with a supply of acetylene gas under pressure, pipe 2 connected -to a supply of oxygen gas under.

pressure and valves at and 5 set to regulate the feeding of such gases to chamber 7 and passage 8' at substantially the same pres.- Chamber 7 provides a sort of supplementary gas reservoir and serves to maintain a constant pressure of fuel gas at the burner tip through varying demands made on the burner. The velocity of the gas through passage 8 is greater than the velocity of the gas through passage 7 owing to the relative sizes, therefore, the passage of the gas of passage 8 through a corner of chamber 7 deadens the velocity of such gas before it reaches passage 9 permitting the twogases to enter passage 9.1n their relative quantities and substantially equal velocities to support proper combustion at the tip 10. The particular arrangement of pas sage 8 through the corner of chamber 7 prevents a mixture'of any considerable amount of the gases in chamber 7 and thereby reduces burning of such gases in the burner to a minimum in case of popping back. It is therefore obvious that the relative pressures of the gases in their supply sources will not afiect the combustible mixture at the tip sin'ceeach gas is carried through the burner by the pressure'from its own source. 1

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to availmyself of such variations and modifications as come within the scope of the appended claims.

Having described my invention what I claim as new and desire .to secure by Letters Patent; is: 1. A welding torch comprising a body having an axial chamber therein, an axial discharge passage leading from one end of said body and a passage substantially smaller than said chamber passing through one cornerof the latter and joining said first mentioned passage near the juncture of the latter with said chamber, substantially as described. 5 2. A Welding torch comprising a body having a fuel gas-reservoir chamber therein and a discharge passage leading from said chamber to the outside of said body, and an oxidizing gas passage of comparatively small 0 bore passing through the corner of said chamber and communicating With said discharge passage near the juncture of the tially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

are eenarrri.

Witnesses:

JOSHUA R. H. Poms, ARTHUR A. OLSON. 

